Malicious PDF — malware analysis report

Static analysis result for SHA-256 5338b12ad5465ff0…

MALICIOUS

PDF

83.5 KB Created: 2021-08-22 02:09:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bf18ba1fc9f1b9c41e5cb96c0dd7876a SHA-1: e8ea7b59bb42ef27effe8d98d99c58571753e278 SHA-256: 5338b12ad5465ff0178e3f4d4f5f5d1d149d84cc2fb538c15fa6d6f95822ff60
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous external URIs pointing to compromised websites and link farms, suggesting an attempt to redirect users to malicious sites. ClamAV detection and ML classification further support its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://drafthe.ru/uplcv?utm_term=best+mpc+app+for+android PDF link annotation
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/48cfa96311805c83a70c34ee5eb0ec4a/80424396310.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/8624326206.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/42633614066.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/14828418dfb37318803806f8347b997d/duwabajat.pdfIn PDF document text
    • http://yjccnc.com/upload/files/xukugogokovirunogozewug.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/jewutuda.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb54e73975b---gebunevumixenefatemul.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ef10ea971---40934055994.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/218dae0920b6debb87577adcb617569a/30781180767.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/s2frpl2tgitktppa7nldeun4h1/43910640365.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/zubavodujofapalotavefu.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/damofupeneleseto.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a52faf47212---85027070663.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/24538724556.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/26211642463.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/kimanepug.pdfIn PDF document text
    • http://tchid.net/userfiles/file/nivazikeneveriwugenizo.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/76463177067.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/22908750840.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607875872db6f---mabowusumo.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5943c2cf4---vegenaginamulivasixoninod.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/362cbd30f01a9d1cf055a6d94ad80cc2/kavewizimewibeliguw.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE400 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC17 10788 bytes
SHA-256: d381f7febd96e042b075ca26e725f33d6a2732f8ce61abd3a78e4429d08546d4
font_02_sfnt_off000114ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EC 16668 bytes
SHA-256: 75e562df5883e359ecbcd2e3b9420f116b2baca1137f7ab812a31afaa091034e

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